Event: Division 2

Opponent Rating Result
Thomas Gregory 1646 0 - 1
Tom Rosenberg 1831 1 - 0
Jeremy Gardner 1691 0 - 1
John E Richards 1849 0 - 1
Elmira Walker 1722 ½ - ½
Yuvraj Kumar 1912 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1575 = (10651 + 400 * (1 - 4)) / 6)

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